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1、EFFECTOFANOSCILLATINGCYLINDERONANEIGHBOURINGCYLINDERWAKEByYingYangAthesissubmittedinconformitywiththerequirementsforthedegreeofMasterDepartmentofMechanicalandElectronicEngineeringUniversityofHarbinInstituteofTechnologyApril2004ABSTRACTFlow-inducedvibrationonabluffbodyincrossfl
2、owhasbeenextensivelyreportedintheliteraturebecauseofitspracticalsignificance.Nevertheless,ourunderstandingofthisproblemisfarfromcomplete.Forinstance,howdoesanoscillatingfluid-cylindersysteminfluenceaneighbouringcylinderwake?Thisquestionisrelevantinengineering,whereanoscillatin
3、gfluid-structuresystemisfrequentlyassociatedwiththepresenceofaneighbouringstructuresuchasheatexchangertubes,aclusterofhigh-risebuildings,[1]bundledtransmissionlinesandpilesofoffshorestructures.Laietal.investigatedexperimentallyflowinterferencebetweenoneoscillatingandonestation
4、arycylinderandIIfoundthatthefrequency(f)ofvortexsheddingfromthestationarycylindercouldbesmodifiedbytheoscillationoftheothercylinder,resultinginthelock-inoffwiththesoscillationfrequency(f).However,duetothelimitationofexperiments,manyissuesonethisproblemremaintoberesolved.Forexa
5、mple,thedragandliftforcesoncylindersarenotmeasured.Thereisinsufficientinformationonhowthistypeoflock-independsonthecylindercentre-to-centrespacing,T/d,thecylinderoscillatingamplitude,A/d,andthefrequencyratio,f/f,wheredisthecylinderdiameterandfisthevortexsheddingeoofrequencywhe
6、ntheoscillationisabsent.Theresearchaimstoinvestigatenumericallyhowanoscillatingfluid-structuresystemaffectsvortexsheddingfromaneighbouringstationarycylinder,thuscomplementingtheexperimentalinvestigationoftwoidenticalcircularcylindersinaside-by-sidearrangement.Thecalculationisc
7、onductedinarectangularareaof40d×20d,usinganewlydevelopedlatticeBoltzmannmethodbytheC++language.Keywordsside-by-sidearrangement,twocircularcylinders,LatticeBoltzmannmethod,lock-inphenomenon,flowstructureIIIACKNOWLEDGEMENTSIwouldliketodeeplyacknowledgemysupervisor,ProfessorY.Zho
8、uwhoguidedmeintomyresearchareaofcomputationalfluiddynamics(CF
